To unlock Big Z you must win every race in the Big Z challenge.
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There are no unlock codes for World of Zoo on Nintendo DS. World of Zoo was released on Nintendo DS in 2009.
you can't unlock regions yet. Nintendo are thinking about it because oh the hacking on DS Lite's.
You have to beat Big Bossdown in under 9 minutes with either character (Starfy OR Starly).
Try LPSTRU to get the giraffe and unlock winter world
MVY759 is the code to unlock Nightwing on Lego Batman: The Video Game for DS